He IS high unless the rifle is in museum quality condition. Take a hard look at the bore- the ammo for those was corrosive primed, lot of those with pitted bores. Also the rifle uses an "en bloc" sort of clip. Without those, you have a single shot. When the MILSURP ammo was cheaper than BBs, and the rifles are $20, it was a good deal. Milsurp ammo has gone away.
Plus side- moderate recoil, decent accuracy if you have a good barrel.
Offer him $125 in cash and see if he geeks.